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you best bet is buying a non TFSI TDI engine as the injectors spray directly on the piston make it efficient when new and worse then the 1.8T after 10k miles.. the only way i think to minimize it is buy getting a manifold like alex priming the injector to soak the valves every so often which would keep it clean a catch can will help but not cure it as in Alex's case.. the old 1.8T didn't have this problem as the injectors sprayed directly onto the valves top down approach unlike the TFSI etc..
what also would be interesting is alongside the fuel rail on Alex's manifold if he got port injection; wonder how that would work on the carbon build although methanol is being sprayed in miniscule portions
It won't be meth going through the rail on mine.
We know from some other guys running WMI and my own results,that pre-TB injection doesn't make any difference from WMI.
There's also no evidence that port injection for WMI makes any difference either as the volumes are pretty small overall,and nowhere near the amount of petrol injected in the same time,and it's not running constantly.
Also,to run that sort of system,you need a manifold like the HEP or Boulekos,plus a controller for not only the fuel rail,but also a sequential WMI system.